iwlwifi: mvm: simplify iwl_mvm_dbgfs_register

No need to pass the dbgfs_dir just to assign it to mvm.
Assign to mvm and then call iwl_mvm_dbgfs_register.

This is a preparation towards the addition of a delayed
op_mode_start flow.
This will allow to split the op_mode_start flow.
Registration to debugfs must happen after we register to
mac80211 and the registration to mac80211 will soon be
delayed in certain cases. In order not to have to remember
the debugfs_dir in a separate variable, just set it into
the mvm structure so that it can be usable later.

Declare mvm->debugfs_dir in the iwl_mvm structure even when
IWLWIFI_DEBUGFS isn't enabled to simplify the source code.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210210171218.a92ee491863d.I047923aa3598fbf4fb6fce2cdff75a4969fedd76@changeidSigned-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c

@@ -2037,26 +2037,24 @@ void iwl_mvm_sta_add_debugfs(struct ieee80211_hw *hw,
 	MVM_DEBUGFS_ADD_STA_FILE(amsdu_len, dir, 0600);
 }
 
-void iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
+void iwl_mvm_dbgfs_register(struct iwl_mvm *mvm)
 {
 	struct dentry *bcast_dir __maybe_unused;
 	char buf[100];
 
 	spin_lock_init(&mvm->drv_stats_lock);
 
-	mvm->debugfs_dir = dbgfs_dir;
-
 	MVM_DEBUGFS_ADD_FILE(tx_flush, mvm->debugfs_dir, 0200);
 	MVM_DEBUGFS_ADD_FILE(sta_drain, mvm->debugfs_dir, 0200);
 	MVM_DEBUGFS_ADD_FILE(sram, mvm->debugfs_dir, 0600);
 	MVM_DEBUGFS_ADD_FILE(set_nic_temperature, mvm->debugfs_dir, 0600);
-	MVM_DEBUGFS_ADD_FILE(nic_temp, dbgfs_dir, 0400);
-	MVM_DEBUGFS_ADD_FILE(ctdp_budget, dbgfs_dir, 0400);
-	MVM_DEBUGFS_ADD_FILE(stop_ctdp, dbgfs_dir, 0200);
-	MVM_DEBUGFS_ADD_FILE(force_ctkill, dbgfs_dir, 0200);
-	MVM_DEBUGFS_ADD_FILE(stations, dbgfs_dir, 0400);
-	MVM_DEBUGFS_ADD_FILE(bt_notif, dbgfs_dir, 0400);
-	MVM_DEBUGFS_ADD_FILE(bt_cmd, dbgfs_dir, 0400);
+	MVM_DEBUGFS_ADD_FILE(nic_temp, mvm->debugfs_dir, 0400);
+	MVM_DEBUGFS_ADD_FILE(ctdp_budget, mvm->debugfs_dir, 0400);
+	MVM_DEBUGFS_ADD_FILE(stop_ctdp, mvm->debugfs_dir, 0200);
+	MVM_DEBUGFS_ADD_FILE(force_ctkill, mvm->debugfs_dir, 0200);
+	MVM_DEBUGFS_ADD_FILE(stations, mvm->debugfs_dir, 0400);
+	MVM_DEBUGFS_ADD_FILE(bt_notif, mvm->debugfs_dir, 0400);
+	MVM_DEBUGFS_ADD_FILE(bt_cmd, mvm->debugfs_dir, 0400);
 	MVM_DEBUGFS_ADD_FILE(disable_power_off, mvm->debugfs_dir, 0600);
 	MVM_DEBUGFS_ADD_FILE(fw_ver, mvm->debugfs_dir, 0400);
 	MVM_DEBUGFS_ADD_FILE(fw_rx_stats, mvm->debugfs_dir, 0400);
@@ -2079,7 +2077,7 @@ void iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
 	if (mvm->fw->phy_integration_ver)
 		MVM_DEBUGFS_ADD_FILE(phy_integration_ver, mvm->debugfs_dir, 0400);
 #ifdef CONFIG_ACPI
-	MVM_DEBUGFS_ADD_FILE(sar_geo_profile, dbgfs_dir, 0400);
+	MVM_DEBUGFS_ADD_FILE(sar_geo_profile, mvm->debugfs_dir, 0400);
 #endif
 	MVM_DEBUGFS_ADD_FILE(he_sniffer_params, mvm->debugfs_dir, 0600);
 
@@ -2131,12 +2129,13 @@ void iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
 	debugfs_create_blob("nvm_reg", S_IRUSR,
 			    mvm->debugfs_dir, &mvm->nvm_reg_blob);
 
-	debugfs_create_file("mem", 0600, dbgfs_dir, mvm, &iwl_dbgfs_mem_ops);
+	debugfs_create_file("mem", 0600, mvm->debugfs_dir, mvm,
+			    &iwl_dbgfs_mem_ops);
 
 	/*
 	 * Create a symlink with mac80211. It will be removed when mac80211
 	 * exists (before the opmode exists which removes the target.)
 	 */
-	snprintf(buf, 100, "../../%pd2", dbgfs_dir->d_parent);
+	snprintf(buf, 100, "../../%pd2", mvm->debugfs_dir->d_parent);
 	debugfs_create_symlink("iwlwifi", mvm->hw->wiphy->debugfsdir, buf);
 }

drivers/net/wireless/intel/iwlwifi/mvm/mvm.h

@@ -893,8 +893,12 @@ struct iwl_mvm {
 	/* last smart fifo state that was successfully sent to firmware */
 	enum iwl_sf_state sf_state;
 
-#ifdef CONFIG_IWLWIFI_DEBUGFS
+	/*
+	 * Leave this pointer outside the ifdef below so that it can be
+	 * assigned without ifdef in the source code.
+	 */
 	struct dentry *debugfs_dir;
+#ifdef CONFIG_IWLWIFI_DEBUGFS
 	u32 dbgfs_sram_offset, dbgfs_sram_len;
 	u32 dbgfs_prph_reg_addr;
 	bool disable_power_off;
@@ -1700,12 +1704,11 @@ void iwl_mvm_rx_umac_scan_iter_complete_notif(struct iwl_mvm *mvm,
 
 /* MVM debugfs */
 #ifdef CONFIG_IWLWIFI_DEBUGFS
-void iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir);
+void iwl_mvm_dbgfs_register(struct iwl_mvm *mvm);
 void iwl_mvm_vif_dbgfs_register(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
 void iwl_mvm_vif_dbgfs_clean(struct iwl_mvm *mvm, struct ieee80211_vif *vif);
 #else
-static inline void iwl_mvm_dbgfs_register(struct iwl_mvm *mvm,
-					  struct dentry *dbgfs_dir)
+static inline void iwl_mvm_dbgfs_register(struct iwl_mvm *mvm)
 {
 }
 static inline void

drivers/net/wireless/intel/iwlwifi/mvm/ops.c

@@ -907,7 +907,8 @@ iwl_op_mode_mvm_start(struct iwl_trans *trans, const struct iwl_cfg *cfg,
 		goto out_thermal_exit;
 	mvm->hw_registered = true;
 
-	iwl_mvm_dbgfs_register(mvm, dbgfs_dir);
+	mvm->debugfs_dir = dbgfs_dir;
+	iwl_mvm_dbgfs_register(mvm);
 
 	return op_mode;